Apparatus for chamfering gear-teeth.



R. B. WEAVER.

APPARATUS FOR GHAMFERING GEAR TEETH.

APPLICATION FILED J'AN. Z5,190B.

Patented Jan. 12, 1909.

6 SHEETS-SHEET 1.

R. B. WEAVER. APPARATUS FOR GHAMFERING GEAR TEETH.

APPLIOATION FILED JAN. 25,19 08.

Patented Jam-12,1909.

6 EBETS-SKEET 2.

wane/599a R. B. WEAVER. APPARATUS FOR GHAMFERING GEAR TEETH.

APPLICATION FILED IAN. 25,1908.

909,71 9. Patented Jan. 12. 1909.

.6 SHEETE-SHEET 3.

I i i' ammwlioz R. B. WEAVER. APPARATUS FOR GHAMFERING GEAR TEETH.APPLICATION FILED JAN.25, 1908.

Patented Jan. 12, 1909 6 SHEETSSHEET 4- R B. WEAVER. APPARATUS FORCHAMP-BRING GEAR TEETH.

APfI-IOATION FILED um. 25, 1908, 7

909,719.. Patented Jan..12, 1909,

ums-51mm" a.

R. B. WEAVER. AQPPARATUS FORUHAMFERING GEAR TEETH. APPLICATION FILED.TAN.25,1908.7

, 909,71 9.. Patented Jan. 12, 1909.

6 SHEETS-SHEET 6.

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ROBERT B. WEAVER, OF OLEVELAN D, 01110, ASEa'lGhOR TO LONG ARM SYSTEMCOMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

APPARATUS FDR CHAMFERING GEAR-TEETH.

Specification of Letters Patent.

latented Jan. .12, 1909.

Application riled. January 25, 1908. Serial No. 412,621.

To alltci'mm it may concern:

Be it known that 1, Pioneer B. \Vnavnn, a citizen of the United States,residing at Cleveland, in the county of Guyahoga and State oi? Ohio,have invented certain new and useful Improvements in Apparatus forChamfering Gear-'l eeth; and 1 do hereby declare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to an appa "atus for ehamfering the teeth of gearsin order to facilitate sliding the teeth of one gear wheel into meshwith those of another, whenever a change of cars is desired.

It is well known that in automobiles, and in other machines employinggearing, it is very desirable-to have one or both ends of the gear teethrounded, or chamfcred, so as to easily engage and disengage other teethwhen slid change of speed, or a reversal of parts. Heretofore this toothchanitering has been done by hand filing, which is very tedious andexpensive, as well as inaccurate, and it has also been done bymachinery. But in the only machines with which I am acquainted, thisoperation has been either slow and inaccurate in that it required thegoing over of every tooth by hand tiling after the machining is done, orthe machine itself has been slow, heavy, expensive and complicated, andthe results not. at all satiefzwtory.

It is to overcome the above defects, which is the object of myinvention, and to these ends my invention consists in the novelmechanism comp ing a fixed rotary cutter, and an automatic means formoving the teeth of the gear to be cut in directions both rotary andcndwise with reference to the axis of said gear. This mechanism, ofcourse. may be made as an indqienllcnt machine and used to cha n'tcr theteeth of any gr rs whatever, but 1 preter, when it is to housed inautomobile work, to make it as an attachment to be placed on the platenof a small miller, a horizontal boring mill, or on the tool carriage ofa small lathe.

My invention further consists in the novel combinations of parts morefully hereinafter described and particularly pointed out. in the iclaims.

Referring to the accompanying drawings forming a part of thisspecification :--Figure along their shafts to etl'ect a;

' 1, represents an end elevation of my tooth chamfering attachment. Fig.2, a plan view of the same. Fig. 3, a sectional view taken on the linei\.-A of Fig. Fig. 4, a sectional view taken on the line BB of Fig. 2.Fig. 5, a detail view of the cam for controlling the motion of the toothbeing chamlcrcd. Figs. (3, 7 and 8, dili'erent positions ol the toothwith relation to the cutter. Fig. 9, a perspective view of a finishedtooth, showing two positions of the cutter relative thereto. Fig. 10, adetail view of a modified form of cam for controlling the'motion of thetooth. Fig. 11, a perspective of a tooth having a niodiied chamferededge. Figs. 12 and 3, end and side elevation-a1 views of a modification,and Fig. 141, a plan view of the frame casting.

Like numerals indicate views.

1, represents the platen of the miller, lathe or other machine to whichmy attachment is secured; 2, a frame casting supporting the severalparts of my machine; 3, the work spindle; l, the rotating andreciprocating work, or gear, whose teeth are to be chamtered; and 5, thefixed rotating cutter. The work 1. is secured to the spindle 3, bysuitable collars i washers 4?, and a nut 4, as shown.

To the casting 9, is fitted the slide 6, provided with the clamping nut7, and in this slidt is suitably journaled the spindle 8, provided withthe worm 9, adapted to intcrmesh with the work 4., and thereby controlthe rotary motion of the latter.

The spindle S, is provided with the gear 10, which meshes with the idler11, mounted on. the end of the arm 12, pivoted on the projection 13,carried by the compound bracket bearing 1 secured to the (astu'ig Q.

The work spindle 5, is mounted in the sliding block 15, to which issecured by means of the screws '17, the pin bracket 16, carrying thepins 18 and 18, one of which is provided with the roller 19.

lassing through the projection 13, is the spindle 20, on which mountedthe gear wheel 21, provided with the PIOJQCllOD. 22, and meshing withthe pinion 24%, on the shaft .5, carrying the power pulley 30. This gearwheel 21, also, meshes with the idler gear Wlktl 11, as shown.

Mounted on the projection 29, and secured to the gear wheel 21, by thescrew 23, and

worm located above the work, and 69, the

power transmitting pulley, all like or substantially like thecorresponding parts above described, except the work spindle ishorizontal instead of vertical, and the worm slide is vertical insteadof horizontal. The base (31, is provided with the curved'slots 70,struckfrom the center of the base, and permitting the said base and thewhole attachment including the work spindle to be swiveled to thesupport 60; and therefore permitting the plane of the work 67, to makeany desired angle with the axis of the cutter 66. It results directlyfrom this disposition of the parts, that the teeth may be cut more belowthe pitch line than above it, and that in fact any desired contour maybe given to the chamfered surfaces. It is of course apparent that inthis modification if the plane of the work coincides with or is,parallelto the axis of the center, then a cam such as 27, will give a chamferedcontour 71, such as is illustrated in Fig. 9, or if a cam such as '72,shown in Fig. 10, is employed, the contour 7 3, shown in Fig. 11, willbe given the end of the tooth. The same, of course, will also be true ofthe form of my invention first described. But, in thismodified form ofmy attachment, I may while employing either of these cams,

or any other suitable cams. further modify- -the contours of thechamfered ends of the teeth, by simply rotating the work until its planemakes the desired angle with the axis of the cutter. In other words,this modified form of my invention will not only do all that the firstform will do. but it will give additional forms to the ends of the teethwithout changing the cams.

In neither form of my invention is it necessary to stop either themilling or other machine to which my attachment is secured. nor theattachment itself, when it is desired to change the work; for all thatit is necessary to do'is to simply move the table, or other support ofthe attachment, away from the column of the machine, and to take 0H onepiece of work and to put on another, and to then slowly move the tableback to the transverse top of the machine.

It will thus be observed that by means of chamfering the ends of gearteeth, I am enabled to secure the gears to be operated on to a suitablework spindle, and to reciprocate the ends of the teeth past a fixedrotating cutter while slowly revolving the same around the axis of thework spindle. That the effect of this simultaneous reciprocation androtation of the ends of the teeth is to cause one side of the same endof the teeth to be always out on one phase of the reciprocation, and theother side of the said end to be cut on the reverse phase of the movemenso that the surface to be chamfered rolls, so to speak, down on one sideof the fix d miter, under the same and up on the &

other side, for one end of the teeth, and up on one side over and downon the other side of said cutter, for the other end of the teeth.

The advantages of this motion for chamfering gear teeth over any otherswith which I am familiar are :The continuous and automatic action of thecutter on the chamfered surfaces, produces a much greater output in thesame time; the very small size and weight of my attachment inCOIHptIIlSOXI with a heavy machine for doingthe same work, enables floorspace to be saved, and all waste of power, except when the attachment isin actual use. 31nd the fact it is an attachment, enables it to be putonto any suitable machine to do a temporary job and then immediatelytaken off. And the fur-- ther fact that the gear to be chamferedfurnishes its own index, causes a great deal of time tobe saved, whichis necessarily lost,

Where indexing must be done by hand, as is the case on all the machinesfor doing this work with which I am acquainted.

Of course, I do not wish to be understood as' limiting my invention tothe exact procedure and details of construction above set forth, sinceitis evident that they may be widely varied Withoutv departing from thespirit of invention.

IVhat I claim is V 1. In a gear chamfering machine the combination of arotary cutter; a reciprocating work slide adapted to reciprocate thegear whose teeth are to be ehamfered, and a rotatable gear adapted toengage and to continuously revolve said teeth around the axis of saidslide,-substantially as described.

2. In a gear chamfering machine the COID: bination of a rotary cutter; awork slide adapted to reciprocate the gear teeth to be chamfered; asuitable cam adapted to reciprocate said slide, and a rotatable gearadapted to engage said teeth and continuously revolve the same,substantially as described.

3. In a gear chamfering attachment. the combination of a rotary cutter;a work spindle adapted to hold the gear whose teeth are to be chamfered;a work slide adaptedflto reciprocate said teeth on different sides ofsaid cutter; a suitable cam adapted to reciprocate said slide; a gearadapted to engage said teeth and to continuously revolve the same aroundthe axis of said spindle as a center, and a common means forcontinuously revolving said cam and gear, substantially as described.

4. In a gear chamfering attachment the combination of a rotary .cutter;a work spindle adapted to hold the gear whose teeth are to be chamfered;a work slide adapted to reciprocate said teeth on different sides ofsaid cutter; a suitable cam and connections adapted to reciprocate saidslide; a gear adapted to engage said teeth to index the same andtocontinuously' revolve the same around the axis of said spindle as acenter, and a common means comprising a set'of gearing for continuouslyrevolving said-cam and gear, substantially as described. .5. In a gearchamt'ering attachment, the combination of a rotary cutter; a workspindle; means to clamp thereto the gear having the teeth to bechamfered; a slide adapted to reciprocatesaid teeth; abaacket on theslide provided with a roller a cam for reciprocating the roller; a gearlfor continuously rotating said teeth; a power pulley and a train ofgears driven by the same for simultaneously operating said cam and saidgear, substantially as described.

6. In a gear chamfering, attachment, the

combination of a rotary ,'cutter; afwork spin- .dle; means to clampthereto the gear having the teeth to be chamfered; aslide adapted toreciprocate said teeth; a bracket on the slide provided with a roller; acam for reciprocating the roller; an adjustable worm for continuouslyrotating said teeth; a power pulley and a train of gears driven b thesame for simultaneously operating saic cam and said worm, substantiallyas described.

7. In a gear chai'nfering machine the com bination of a rotaryv cutter;a work spindle; means to incline the axis of the saine to the axis ofsaid cutter; a reciprocating work slide adapted. to reciprocate the gearwhose teeth are to be chamfered, and a. rotatable gear adapted to engageandto continuously revolve said teeth around the axis of said slide,substantially as described.

8. In a gear chamfering machine the combination of a rotary cutter; awork spindle; means to incline the axis of the same tothe axis of saidcutter; a work slide adapted to reciprocate the gear teeth to bechamtered; a suitable .cam adapted to reciprocate said slide, and arotatable worm adapted to ensaid teeth and continuously revolve thesanie"lvvliile the cutter successively acts on diflerent surfaces ofsaid teeth, substantially as described.

9. In a gear chamfering attachment adapted to co'ciperate with a cutter,the combination of a work spindle adapted to hold. the

gear whose teeth are to be chamfered; a.

work slide adapted to reciprocate said teeth; a suitable cam .adapted toreciprocate said slide; means adapted to engage said teeth and tocontinuously revolve the same around the axis of said 'spindle as acenter; means for continuously revolving said cam and first mentioned 1cans; and means for angularly adjusting the work in the plane of thecutting action, substantially as described.

1' 10. In a gear chamfering attachment adapted to coiiperate with acutter, the combination of a thereto the gear having the teeth to bechamvfered; a slide adapted to reciprocate said teeth; a bracket on theslide; means for reciprocating said slide; means for continuouslyrotating said teeth; a power pulley; a train of gears driven by the samefor simultaneously operating said slide reciprocating means and saidteeth rotating means; and means for angularly adjusting the work in theplane of the cutting action, substantially as described.

11. In gear chamfering mechanism, the combination of a cutter; means tosupport the gear whose teeth areto be chamfered in ,properrelation tosaid cutter; means to re ciprocate said teeth While being chamfered;means to rotate said teeth while the same are being reciprocated; andmeans permitting said support and gear to be angul'arly adjustedrelative to the said cutter, substantially as described.

12. In a gear cliamiering' attachment work spindle; means to secure.

adapted to cooperate with a cutter, the com- 'bination of a support; awork spindle adapted to hold the gear whose teeth are to be chainfered;means to swivel said attachment on its support and thereby permit thework to be angularly adjustable in the plane of the cutting action; andmeans to reciprocate said teeth, substantially as described.

13.111 a gear chainfering attachment adapted to enact with a cutter, thecombination of a support; a work spindle adapted to hold the gear whoseteeth are to be chamfered; means to swivel said attachment on itssupport andthereby permit the angular adjustment of the gear blank inthe plane of the cutting action, means to continuously revolve saidteeth around the axis of said spindle; and means to simultaneouslyreciprocate said teeth, substantially as described.

In testimony whereof, I aflix my signature, in. presence of twowitnesses. ROBERT B. VVEAVEB.

lVitnesses:

VJ. B. CowLns, CHAS. C. TYLER.

